Process for the removal of fluoride from waste water

Details Process for the removal of fluoride from waste water Process for the removal of fluoride from waste water

1991-01-22

1992-04-21

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210915, 423163, C02F 158

Patent

active

051065096

ABSTRACT:
The invention relates to a process for the removal of fluoride from waste water in the form of a slightly soluble salt by mixing the waste water with a reagent. According to the invention the fluoride containing waste water is thoroughly mixed with the water soluble reagent at a suitable pH in a reactor of the fluidized bed type, which is provided with an appropriate seed material, on which the fluoride salt crystallizes out, whereby the thus obtained pellets comprising the seed material with the crystalline fluoride salt, is removed from and new seed material is added to the reactor from time to time. According to the present process as reagent CaCl.sub.2 is used, whereas the pH is adjusted to an appropriate value.

REFERENCES:
patent: 4028237 (1977-06-01), Nishimura et al.
patent: 4226710 (1980-10-01), Bruckenstein
patent: 4323462 (1982-04-01), Bruckenstein
patent: 4764284 (1988-08-01), Jansen

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